DOC: minor readme cleanup and typo fix

Author: bsipocz

README.rst

@@ -62,22 +62,12 @@ dependencies required to build the documentation or run the tests):
     $ python -m pip install -U --pre astroquery[all]
 
 
-To install the 'bleeding edge' version:
+To install the 'bleeding edge' version from GitHub:
 
 .. code-block:: bash
 
    $ python -m pip install git+https://github.com/astropy/astroquery.git
 
-or cloned and installed from source:
-
-.. code-block:: bash
-
-    $ # If you have a github account:
-    $ git clone git@github.com:astropy/astroquery.git
-    $ # If you do not:
-    $ git clone https://github.com/astropy/astroquery.git
-    $ cd astroquery
-    $ python -m pip install .
 
 Using astroquery
 ----------------
@@ -114,7 +104,7 @@ looked up at the following `Zenodo page <https://doi.org/10.5281/zenodo.591669>`
 Additional Links
 ----------------
 
-Maintained by `Adam Ginsburg`_ and `Brigitta Sipocz <https://github.com/bsipocz>`_
+Maintained by `Adam Ginsburg`_ and `Brigitta Sipőcz <https://github.com/bsipocz>`_
 
 
 .. _Download Development ZIP: https://github.com/astropy/astroquery/zipball/main